“Im getting old, I cant see to focus to solder with anything directly in front of me anymore and the quality of my soldering is comical. Not any more. You can use the jig available to gently, and I do mean gently but firmly tap these headers into the sockets on the PI boards. A few sharp firm taps as you work side to side is all that is required with a medium sized hammer and it will locate down and give you a working GPIO header in under a minute. Any side effects? None, just work side to side to keep the same volume of pressure as you work along and take your time. It just works simply and effectively.”
“very useful item especially when soldering is not your strong point.
Be careful when using a hammer (light weight hammer recommended)
Gentle tapping to fit the gpio header.”